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The physician writes an order for a client to receive 1 mg of vitamin B12 once every month. Vitamin B12 comes in a 1000 mcg/mL vial. The nurse would administer ?... to the client each month.
- A. 0.5 mL
- B. 1.0 mL
- C. 1.5 mL
- D. 2.0 mL
Correct Answer: B
Rationale: First, the nurse needs to convert the milligrams to micrograms. Therefore, 1 mg = 1000 mcg. Since there is 1000 mcg/mL, the nurse would give 1 mL.
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A client weighs 200 lb. The client is to receive 5 mg/kg per dose of a drug. The client will receive ?. mg of the drug in each dose.
- A. 400.0 mg
- B. 454.5 mg
- C. 500.0 mg
- D. 550.0 mg
Correct Answer: B
Rationale: First, the patient's weight must be converted to kilograms: 200 lb ? 1 kg / 2.2 lb = 90.9 kg. Then the dosage is calculated: 90.9 kg ? 5 mg/kg = 454.5 mg.
A group of nursing students are reviewing the various systems of measurement. The students demonstrate understanding of the information when they identify which of the following as a metric system unit? Select all that apply.
- A. Inch
- B. Milligram
- C. Centimeter
- D. Ounce
- E. Pound
Correct Answer: B,C
Rationale: The metric system uses the gram, liter, and meter. Milligram and centimeter are metric units.
A nursing instructor is describing the various work factors that can lead to errors in dosage calculations to a group of nursing students. The instructor determines that the teaching was successful when the students identify which of the following as a factor? Select all that apply.
- A. Poor lighting
- B. Heavy workload
- C. Noise
- D. Temperature
- E. Interruptions
Correct Answer: A,B,C,E
Rationale: Factors in the work environment that often contribute to errors made by people include poor lighting, noise, interruptions, and a taxing workload.
A client has a temperature of 39°C. The client's temperature is degrees Fahrenheit.
- A. 98.6°F
- B. 100.4°F
- C. 102.2°F
- D. 104.0°F
Correct Answer: C
Rationale: To convert from Celsius to Fahrenheit, the formula F = 9/5 ? C + 32 is used. Therefore, 9/5 ? 39 = 70.2, and 70.2 + 32 = 102.2.
The health care provider orders chlorpromazine 25 mg IM. The drug is supplied as chlorpromazine 50 mg/mL in a 1-mL ampule. How much would the nurse administer?
- A. 0.25 mL
- B. 0.5 mL
- C. 0.75 mL
- D. 1.0 mL
Correct Answer: B
Rationale: The drug is supplied as 50 mg in 1 mL. Calculating the dosage using the formula D / H ? Q, the equation would read: 25 mg / 50 mg ? 1 mL = 0.5 mL.